It's important to understand what it means to delete content in meez. There are many ways to organize, reorganize, and move your content around. But deleting content is permanent.
go to the more menu (the 3 dots) to the right of the item you'd like to delete
click the select box to the left of the items you'd like to delete
go to the more menu (the 3 dots) at the top of the page in the navigation bar